Connecting solr with aws RDS Mysql through data import handler - mysql

Question

I recently started implementing solr-cloud on AWS EC2 for search applications. I have created 2 AWS Ec2 instances with the following configurations ---
EC2 Type - t2.medium
ram - 4GB
Disk Space - 8GB
OS - ubuntu 18.04
For the 2 EC2 instances, I have created a security group which allows all inbound traffic. NACL has default settings that allows all inbound traffic as well.
Steps Followed to install Apache Solr -
ssh into ec2 :
ssh -i "pem_file" ubuntu#ec2-public-ipv4-address
cd to /opt directory
run --> sudo apt-update
run --> sudo apt-get openjdk-11
Check java -version
run --> wget https://archive.apache.org/dist/lucene/solr/8.3.0/solr-8.3.0.tgz
run --> tar -xvzf solr-8.3.0.tgz
export SOLR_HOME=/opt/solr-8.3.0
Add /opt/solr-8.3.0 to Path environment variable
Update the sudo vim /etc/hosts file with the hosts --
a. public-ip-v4-address-of-ec2 solr-node-1
Started Solr using the following command -->
sudo bin/solr start -c -p 8983 -h solr-node-1 -force
Checked the opened ports using --> sudo lsof -i -P -n | grep LISTEN
Created collections, shards and replicas using --->
bin/solr create -c travasko -d sample_techproducts_configs -n travasko_configs -shards 2 -rf 2 -p 8983
I repeated the same process on the other EC2 machine and ran solr on it.
Now, to use the data import handler in solr, I edited the following files:
solrconfig.xml
<requestHandler name="/dataimport" class="org.apache.solr.handler.dataimport.DataImportHandler">
<lst name="defaults">
<str name="config">data-config.xml</str>
</lst>
</requestHandler>
data-config.xml
<dataConfig>
<dataSource type="JdbcDataSource"
driver="com.mysql.jdbc.Driver"
url="jdbc:mysql://examplerds.cuhj86yfdpid.us-east-1.rds.amazonaws.com:3306/TRAVASKODB1"
user="examplerds"
password="examplerds#123"/>
<document>
<entity name="MOMENTS"
pk="MOMENT_ID"
query="SELECT MOMENT_ID,MOMENT_TEXT FROM MOMENTS"
deltaImportQuery="SELECT MOMENT_ID,MOMENT_TEXT FROM MOMENTS WHERE MOMENT_ID='${dih.delta.MOMENT_ID}'"
deltaQuery="SELECT MOMENT_ID FROM MOMENTS WHERE LAST_MODIFIED > '${dih.last_index_time}'"
>
<field column="MOMENT_ID" name="MOMENT_ID"/>
<field column="MOMENT_TEXT" name="MOMENT_TEXT"/>
</entity>
</document>
</dataConfig>
managed_schema
<schema name="MOMENTS" version="1.5">
<field name="_version_" type="long" indexed="true" stored="true"/>
<field name="MOMENT_ID" type="integer" indexed="true" stored="true" required="true" multiValued="false" />
<field name="MOMENT_TEXT" type="string" indexed="true" stored="true" multiValued="false" />
</schema>
Downloaded mysql jdbc using the following command:
wget -q "http://search.maven.org/remotecontent?filepath=mysql/mysql-connector-java/5.1.32/mysql-connector-java-5.1.32.jar" -O mysql-connector-java.jar
Add to solrconfig.xml:
<lib dir="${solr.install.dir:../../../..}/dist/" regex="solr-dataimporthandler-.*\.jar" />
<lib dir="${solr.install.dir:../../../..}/dist/" regex="mysql-connector-java.jar" />
After editing the files above, I uploaded them to the solr-cloud using the following zookeper command -->
bin/solr zk -n travasko_config -z solr-node-1:9983 cp /opt/solr-8.3.0/server/solr/configsets/_default/conf/managed-schema zk:/configs/travasko_config/managed-schema
I then checked all the above files in the solr-cloud and could notice the changes i added.
The current issue is that when I select the collection I created above, and click on Dataimport, It throws an error as below --->
The solrconfig.xml file for this index does not have an operational DataImportHandler defined!
Note: The AWS RDS and EC2 instances are in the same VPC sharing the same Security Group.
So why is solrconfig.xml file throwing an error during dataimport ? What am i missing here?

Answer 1

The solution to the above issue was basically setting the java system property for solr versions greater than 8.2.0 as below:
-Denable.dih.dataConfigParam=true
This parameter can be set either in solr.in.cmd or solr.in.sh which can be found inside the directory below: ,
/opt/solr-8.3.0/bin
If, /opt/solr-8.3.0 is the installation directory of solr.
The other method was to pass this parameter as command line parameter while starting solr as below:
sudo bin/solr start -c -p 8983 -h solr-node-1 -Denable.dih.dataConfigParam=true -force
solr-node-1 is the public IPv4 address of the AWS Ec2 instance on which solr is configured.